... CAS:23783-26-8 Appearance: Dark umber liquid 2-Hydroxyphosphonocarboxylic Acid(HPAA)CAS No. 23783-26-8Molecular Formula: C2H5O6P Molecular weight ... stable, hard to be hydrolyzed, hard to be destroyed by acid or alkali, safety in use, no toxicity, no pollution. ... better.Specification: itemsindexAppearanceDark umber liquidSolid content %50.0 minPhosphorous acid(as PO33-)%4.0 maxDensity (20°C)g/cm31.30 ...